520 Extracts.- — Arboriculture. 
purple on the upper. A native of Georg;ia ; and introduced by Mr. T. Nultall. — 
Brit. Fl. Gard. Culture.— We suppose it will grow with the same treatment as 
the other species ; viz, in a pot having turfy peat laid in the bottom, and the upper 
part filled with SpliCtgnum, or Bog- Moss, in which the plant is to be placed; and 
the pot set in a pan of water. — Shelter it either io a frame cr green-house from 
the severity of frost. — Cond. 
MONOCOTYLEDONOUS PLANTS, OR ENDOGENES. 
ORCHIDEyE. 
Aerides corniitum, Horn-flowered Air Plant— A parasitical plant growing on 
trees; curious, and worthy of cultivation. Flowers brown and purple, fragrant, 
something like the Tuberose. Native of the East Indies. Introduced some years 
^^^j by Dr. Roxburgh, and subsequently by Dr.Wallich. Culture. — It flourishes 
in a very damp hot-house, planted in a pot of moss, and suspended from the raf- 
ters. — Bot. Reg. 
Maxilldria tetragona. Four-cornered Maxillaria. — A very interesting parasite, 
worthy of a place in the stove. Flowers, yellowish-green and light purple, very 
fragrant, resembling the smell of fresh violets. Native of the forests of Brazil. 
Introduced in 1827, by J. Mutford, Esq.^5o/. Mag. Culture. — We suppose it 
will, like all the other Maxillariee, thrive in a turfy peat soil mixed with a por- 
tion of decayed wood or saw-dust, and kept in a damp bottom ; it is propagated 
by dividing the roots. — Cond. 
IRIDEJE. 
Gladiolus cocAfed^M*, Spoon-lipped Corn-flag. — A bulbous rooted plant with slen- 
der spear leaves. Flowers, perianthium of a delicate snowy white, the three 
upper segments naked, with an open compass-shaped red mark towards the base. 
A native of the Cape, and received from thence three years ago, by Mr. H. B. 
Page, of Southampton — Sweet'' s Fl. Gaid. Culture — We judge the same treat- 
ment should be given them as the other species, viz. Pot them in a mixture of 
very sandy loam, and peat or leaf mould, and place them in the green-house; 
when they have done flowering, let them have no water until they begin to grow 
again — Cond. 
ASPHODELEA". 
Camdssia esculenta. Eatable Quamash. — A very handsome bulbous plant, difl^ering 
considerably from, and much exceeding in beauty, the species of Scilla, generally' 
known by the name of Quamufh. Flowers, a rich sparkling purple. Native of 
North-west America, growing in the alluvial and partly-overflowed soils, in Co- 
lumbia. Introduced by Mr. Douglas. Culture. — It will grow in peat soil, in the 
open border, and will probably be easily propagated by seed. — Bot. Reg. 
ARBORICULTURE. 
On Pruning Forest Trees. — Particular regard should be paid to their health 
and vigour, and not to their size and age. A vigorous tree, full of sap, and 20 
years of age, may be pruned with more safety than a stunted one 15 years old, 
because the parts cut over would heal sooner in the former one, from its being 
full of sap, than in the latter, which was deficient in sap : indeed the whole art of 
pruning consists in thinning out the branches according to the size, health, and 
vigour of the tree ; to have the tree as well poised with branches as circumstance? 
will allow; and leaving those branches on the tree which will assist the genera 
circulation of the sap. — Gard. Mag. 
